Heat recovery packing seal and cold finger structure

Abstract

The present invention discloses a regenerative packing sealing device and a cold finger structure, relating to the technical field of regenerative refrigerators. The regenerative packing seal comprises a sealing screen, a sleeve, and a pressure ring. The sleeve is configured to be sleeved over a pulse tube, with the sleeve axis parallel to the pulse tube axis. One end of the sleeve is configured to extend into the outer shell of the regenerative unit. The pressure ring is sleeved and fixedly connected to the sleeve. The mesh size of the sealing screen is smaller than the particle size of the regenerative packing. The sealing screen is sleeved over the sleeve and positioned within the regenerative unit. The sealing screen can cover the annular opening at the bottom of the regenerative unit. The downward-facing side of the pressure ring can press the sealing screen tightly against the outlet end of the heat exchanger. The regenerative packing sealing device and cold finger structure prevent the regenerative packing from leaking, achieving a better sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of regenerative refrigerators, and in particular to a regenerative packing sealing device and a cold finger structure. Background Art

[0002] Currently, in regenerative refrigerators, the regenerative filler in the regenerator at the cold finger structure is generally sealed by a sealing net, wherein the sealing net is arranged at an opening at one end of the shell and has an interference fit with the shell, and the regenerative filler is sealed in the shell by the sealing net. When the refrigerator is running, the pulse tube is inserted into the heat exchanger, and the sealing net is close to the air outlet of the heat exchanger. A slit is provided on the air outlet end. The gas is discharged from the air outlet end of the heat exchanger, passes through the regenerative filler and the sealing net, and then enters the regenerator. However, during the operation of the regenerative refrigerator, vibration or tilting is prone to occur. These factors may cause the sealing net to tilt and destroy the interference fit between the regenerator shell and the shell, thereby causing leakage of the regenerative filler. Therefore, there is an urgent need for a regenerative filler sealing device and a cold finger structure with better sealing effect. Summary of the Invention

[0003] The purpose of the present invention is to provide a heat recovery filler sealing device and a cold finger structure to solve the problems existing in the prior art, so that the heat recovery filler is not easy to leak and the sealing effect is better.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a heat recovery filler sealing device, comprising: a sealing mesh, a sleeve and a pressure ring, the sleeve being used to be sleeved outside the pulse tube, the axis of the sleeve being able to remain parallel to the axis of the pulse tube, one end of the sleeve being used to extend into the outer shell of the heat exchanger, the pressure ring being sleeved and fixedly connected to the outside of the sleeve, the mesh size of the sealing mesh being smaller than the particle size of the heat recovery filler, the sealing mesh being sleeved outside the sleeve and located inside the heat exchanger, the downward side of the sealing mesh being flush with the end face of the bottom end of the heat exchanger, the cross-sectional size of the sealing mesh in a direction perpendicular to the axial direction of the pulse tube being the same as the size of the bottom opening of the heat exchanger, the sealing mesh being able to cover the annular opening at the bottom of the heat exchanger, the downward side of the pressure ring being able to press the sealing mesh tightly against the air outlet end of the heat exchanger, the gas in the heat exchanger being able to pass through the plane where the sealing mesh and the pressure ring are located in sequence and enter the heat exchanger.

[0006] In some embodiments, the end of the sleeve away from the regenerator is flush with the bottom end of the pulse tube or farther away from the regenerator than the bottom end of the pulse tube.

[0007] In some embodiments, one end of the sleeve away from the regenerator is flush with the bottom end of the pulse tube, and one end of the sleeve away from the regenerator is provided with a connecting structure for connecting to the guide wire mesh.

[0008] In some embodiments, the inner wall of the sleeve is in close contact with the outer wall of the vessel.

[0009] In some embodiments, the cross-sectional dimension of the pressure ring in a direction perpendicular to the axial direction of the sleeve is the same as the dimension of the bottom opening of the regenerator, and a vent is provided on the pressure ring.

[0010] In some embodiments, the sleeve and the sealing mesh are both made of stainless steel.

[0011] In some embodiments, the pressure ring includes an inner ring, an outer ring and a plurality of support rods, the outer ring is sleeved outside the inner ring, each of the support rods is arranged between the inner ring and the outer ring, one end of the support rod is fixedly connected to the outer ring, and the other end is fixedly connected to the inner ring, the inner circumferential edge of the inner ring is used to be fixedly connected to the sleeve, and there is a gap between two adjacent support rods to form the vent.

[0012] In some embodiments, the support rods are sequentially arranged at equal intervals along the circumference of the inner ring.

[0013] In some embodiments, the sleeve and the pressure ring are both configured to be coaxially disposed with the vessel.

[0014] The present invention also provides a cold finger structure, comprising: a pulse tube, a regenerator and the above-mentioned regenerative filler sealing device, wherein the pulse tube is fixedly connected to the regenerator and one end extends from the bottom of the regenerator, and an annular opening is formed between the bottom of the regenerator shell and the pulse tube, the sleeve is arranged outside the pulse tube, the sealing mesh covers the opening at the bottom of the regenerator shell, and the pulse tube and the regenerator shell are filled with regenerative filler, the sleeve and the pulse tube are used to be inserted into the hole at the air outlet end of the heat exchanger, and the pressure ring presses the sealing mesh onto the air outlet end of the heat exchanger.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The heat recovery filler sealing device provided by the present invention, when installed, first puts the pressure ring on and fixes it on the outside of the sleeve, then puts the sleeve on the outside of the pulse tube and keeps the axis of the sleeve parallel to the axis of the pulse tube, then puts a sealing mesh on the outside of the sleeve, and inserts the sleeve and the pulse tube into the holes at the air outlet end of the heat exchanger, so that one side of the pressure ring presses the sealing mesh tightly against the air outlet end of the heat exchanger, and when the gas in the heat exchanger enters the inside of the heat exchanger, the sealing mesh can seal the heat recovery filler in the heat exchanger, and compared with the sealing mesh with an interference fit with the outer shell of the heat exchanger, since the axes of the sleeve and the pulse tube remain parallel, under the limiting action of the sleeve, the axis of the pressure ring can also remain parallel to the sleeve, the pressure ring will not tilt during the operation of the heat recovery refrigerator, the heat recovery filler will not easily leak, and the sealing effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the cold finger structure in some embodiments of the present invention;

[0019] Figure 2 for Figure 1 Top view of the medium pressure ring;

[0020] In the figure: 1. Sleeve; 2. Sealing wire mesh; 3. Pressure ring; 31. Inner ring; 32. Outer ring; 33. Support rod; 34. Vent; 4. Guide wire mesh; 5. Pulse tube; 6. Regenerator; 7. Regenerator filler. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a heat recovery filler sealing device and a cold finger structure to solve the problems existing in the prior art, so that the heat recovery filler is not easy to leak and the sealing effect is better.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] This embodiment provides a heat recovery packing sealing device, such as Figure 1-2 As shown, it includes: a sealing screen 2, a sleeve 1 and a pressure ring 3. The sleeve 1 is used to be sleeved on the outside of the pulse tube 5. The axis of the sleeve 1 can be kept parallel to the axis of the pulse tube 5. One end of the sleeve 1 is used to extend into the outer shell of the regenerator 6. The pressure ring 3 is sleeved and fixedly connected to the outside of the sleeve 1. The mesh size of the sealing screen 2 is smaller than the particle size of the regenerator filler 7. The sealing screen 2 is sleeved on the outside of the sleeve 1 and located in the regenerator 6. The downward side of the sealing screen 2 is flush with the end face of the bottom end of the regenerator 6. The cross-sectional size of the sealing screen 2 perpendicular to the axial direction of the pulse tube 5 is the same as the size of the bottom opening of the regenerator 6. The sealing screen 2 can cover the annular opening at the bottom of the regenerator 6. The downward side of the pressure ring 3 can press the sealing screen 2 tightly against the gas outlet end of the heat exchanger. The gas in the heat exchanger can pass through the plane where the sealing screen 2 and the pressure ring 3 are located in turn and enter the regenerator.

[0026] When the heat exchanger is in a closed position, the sealing mesh 2 is pressed against the outer wall of the heat exchanger 5 so that the sealing mesh 2 is pressed against the outer wall of the heat exchanger 5. When the heat exchanger is in a closed position, the sealing mesh 2 is pressed against the outer wall of the heat exchanger 5 so that the sealing mesh 2 is pressed against the outer wall of the heat exchanger 5. When the heat exchanger is in a closed position, the sealing mesh 2 is pressed against the outer wall of the heat exchanger 5. When the heat exchanger is in a closed position, the sealing mesh 2 is pressed against the outer wall of the heat exchanger 5

[0027] In one implementation of this embodiment, the end of the sleeve 1 away from the regenerator 6 is flush with the bottom end of the pulse tube 5 or farther away from the regenerator 6 than the bottom end of the pulse tube 5 .

[0028] In one embodiment of this embodiment, the end of the sleeve 1 away from the regenerator 6 is flush with the bottom end of the pulse tube 5. A connecting structure is provided at this end of the sleeve 1 away from the regenerator 6 for connecting to the flow-guiding screen 4. This connecting structure facilitates installation of the flow-guiding screen 4. The connecting structure is preferably a flange extending from the bottom end of the sleeve toward the sleeve's central axis, with the circumferential edge of the flow-guiding screen 4 fixedly connected to the flange.

[0029] In one embodiment of this embodiment, the inner wall of the sleeve 1 is tightly fitted with the outer wall of the pulse tube 5. This tight fit between the inner wall of the sleeve 1 and the outer wall of the pulse tube 5 not only maintains the axes of the sleeve 1 and the pulse tube 5 parallel but also seals the gap between the sleeve 1 and the pulse tube 5, preventing the regenerative filler 7 from leaking out.

[0030] It should be noted that there are many ways to simultaneously keep the axes of the sleeve 1 and the blood vessel 5 parallel and seal the gap between the sleeve 1 and the blood vessel 5. For example, a colloid can be injected between the sleeve 1 and the blood vessel 5 to fix the sleeve 1 and the blood vessel 5 and seal the gap between the sleeve 1 and the blood vessel 5. An annular connector can also be provided between the sleeve 1 and the blood vessel 5, and the circumferential edge of the outer ring of the connector is welded to the inner wall of the sleeve 1, and the circumferential edge of the inner ring of the connector is welded to the outer wall of the blood vessel 5.

[0031] To improve the sealing effect, in one embodiment of this invention, the cross-sectional dimensions of the pressure ring 3 perpendicular to the axial direction of the sleeve 1 are the same as the dimensions of the bottom opening of the regenerator 6, and a vent 34 is provided on the pressure ring 3. If the cross-sectional dimensions of the pressure ring 3 perpendicular to the axial direction of the sleeve 1 are smaller than the dimensions of the bottom opening of the regenerator 6, the vent can be omitted from the pressure ring 3, and gas can simply pass through the gap between the pressure ring 3 and the outer shell of the regenerator 6.

[0032] In one embodiment of the present invention, the sleeve 1 and the sealing screen 2 are both made of stainless steel. Stainless steel has high strength and strong corrosion resistance and a longer service life.

[0033] In one embodiment of this embodiment, the pressure ring 3 includes an inner ring 31, an outer ring 32, and a plurality of support rods 33. The outer ring 32 is sleeved outside the inner ring 31, and each support rod 33 is arranged between the inner ring 31 and the outer ring 32. One end of the support rod 33 is fixedly connected to the outer ring 32, and the other end is fixedly connected to the inner ring 31. The inner circumferential edge of the inner ring 31 is used to be fixedly connected to the sleeve 1. There is a gap between two adjacent support rods 33, forming a vent 34. The multiple support rods 33 arranged at intervals can support and connect the inner ring 31 and the outer ring 32, while forming multiple vents 34 for gas to pass through.

[0034] In order to improve the stability of the pressure ring 3 , in one embodiment of the present invention, the support rods 33 are sequentially arranged at equal intervals along the circumference of the inner ring 31 .

[0035] In one implementation of this embodiment, the sleeve 1 and the pressure ring 3 are both arranged coaxially with the vessel 5 .

[0036] Example 2

[0037] First, the structure of the heat exchanger outlet end needs to be explained. The heat exchanger outlet end is a plate-like structure with holes for inserting the sleeve 1 and the pulse tube 5. A plurality of slits are provided around the holes for gas to pass through.

[0038] This embodiment provides a cold finger structure, such as Figure 1 As shown, it includes: a pulse tube 5, a regenerator 6 and the heat recovery filler sealing device in Example 1. The pulse tube 5 is fixedly connected to the regenerator 6 and one end extends from the bottom of the regenerator 6. An annular opening is formed between the bottom of the regenerator 6 shell and the pulse tube 5. The sleeve 1 is sleeved on the outside of the pulse tube 5. The sealing mesh 2 covers the opening at the bottom of the regenerator 6 shell. The heat recovery filler 7 is filled between the pulse tube 5 and the shell of the regenerator 6. The sleeve 1 and the pulse tube 5 are used to be inserted into the hole at the air outlet end of the heat exchanger. The pressure ring 3 presses the sealing mesh 2 on the air outlet end of the heat exchanger.

[0039] The cold finger structure provided in this embodiment adopts the heat regenerator packing sealing device in the first embodiment, so that the heat regenerator packing in the regenerator is not easily leaked and the sealing effect is better.

[0040] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A heat recovery packing sealing device, characterized in that: include: A sealing wire mesh, a sleeve and a pressure ring, wherein the sleeve is used to be sleeved outside the pulse tube, the axis of the sleeve is kept parallel to the axis of the pulse tube, one end of the sleeve is used to extend into the outer shell of the heat exchanger, the pressure ring is sleeved and fixedly connected to the outside of the sleeve, the mesh size of the sealing wire mesh is smaller than the particle size of the heat recovery filler, the sealing wire mesh is sleeved outside the sleeve and located in the heat regenerator, the downward side of the sealing wire mesh is flush with the end face of the bottom end of the heat regenerator, the cross-sectional size of the sealing wire mesh perpendicular to the axial direction of the pulse tube is the same as the size of the bottom opening of the heat regenerator, the sealing wire mesh covers the annular opening at the bottom of the heat regenerator, and the pressure ring is used to press the sealing wire mesh tightly against the air outlet end of the heat exchanger on the downward side, and the gas in the heat exchanger passes through the plane where the sealing wire mesh and the pressure ring are located in turn and enters the heat regenerator.

2. The heat recovery packing sealing device according to claim 1, characterized in that: One end of the sleeve away from the regenerator is flush with the bottom end of the pulse tube or farther away from the regenerator than the bottom end of the pulse tube.

3. The heat recovery packing sealing device according to claim 2, characterized in that: One end of the sleeve away from the regenerator is flush with the bottom end of the pulse tube. One end of the sleeve away from the regenerator is provided with a connecting structure, and the connecting structure is used to connect the guide wire mesh.

4. The heat recovery packing sealing device according to claim 1, characterized in that: The inner wall of the sleeve is in close contact with the outer wall of the vessel.

5. The heat recovery packing sealing device according to claim 1, characterized in that: The cross-sectional dimension of the pressure ring in a direction perpendicular to the axial direction of the sleeve is the same as the dimension of the bottom opening of the regenerator, and a vent is provided on the pressure ring.

6. The heat recovery packing sealing device according to claim 2, characterized in that: The sleeve and the sealing wire mesh are both made of stainless steel.

7. The heat recovery packing sealing device according to claim 5, characterized in that: The pressure ring includes an inner ring, an outer ring and multiple support rods. The outer ring is sleeved outside the inner ring. Each support rod is arranged between the inner ring and the outer ring. One end of the support rod is fixedly connected to the outer ring, and the other end is fixedly connected to the inner ring. The inner circumferential edge of the inner ring is used to be fixedly connected to the sleeve. There is a gap between two adjacent support rods to form the vent.

8. The heat recovery packing sealing device according to claim 7, characterized in that: The support rods are arranged in sequence at equal intervals along the circumference of the inner ring.

9. The heat recovery packing sealing device according to claim 2, characterized in that: The sleeve and the pressure ring are both used to be coaxially arranged with the vessel.

10. A cold finger structure, characterized in that: include: A pulse tube, a regenerator and a heat recovery filler sealing device according to any one of claims 1 to 9, wherein the pulse tube is fixedly connected to the regenerator and one end extends from the bottom of the regenerator, an annular opening is formed between the bottom of the regenerator shell and the pulse tube, the sleeve is sleeved outside the pulse tube, the sealing mesh covers the opening at the bottom of the regenerator shell, heat recovery filler is filled between the pulse tube and the regenerator shell, the sleeve and the pulse tube are used to be inserted into the hole at the air outlet end of the heat exchanger, and the pressure ring presses the sealing mesh onto the air outlet end of the heat exchanger.

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